package com.szjlc.blog.common.interceptor;

import com.szjlc.blog.common.utils.TraceIdUtil;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.MDC;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * 日志拦截器
 * @author steve
 * @since 2022-11-28 22:50
 */
@Component
public class LogInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 拦截请求url，判断请求种是否有traceId，无则生成
        String traceId = request.getHeader(TraceIdUtil.TRACE_ID);
        traceId = StringUtils.hasText(traceId) ? traceId : TraceIdUtil.generateTraceId();
        MDC.put(TraceIdUtil.TRACE_ID, traceId);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //调用结束后删除
        TraceIdUtil.remove();
    }
}
